文章摘要
次氯酸钠浸金电化学及难浸金矿浸出实验研究
Electrochemical Profile of Leaching Gold with Sodium Hypochlorite and Experiment on Leaching A Refractory Gold Ore
投稿时间:2017-05-17  
DOI:
中文关键词: 有色金属冶金  次氯酸钠  极化曲线  电化学  浸金
英文关键词: nonferrous metallurgy  sodium hypochlorite  polarization curve  electrochemistry  leaching gold
基金项目:贵州省科学技术基金项目(黔科合J字[2010]2003)。
作者单位E-mail
陈亮 贵州大学 材料与冶金学院贵阳 550025;贵州冶金资源综合利用工程研究中心 贵州省冶金工程与过程节能重点实验室贵阳 550025  
唐道文 贵州大学 材料与冶金学院贵阳 550025;贵州冶金资源综合利用工程研究中心 贵州省冶金工程与过程节能重点实验室贵阳 550025 tangdaowen@sina.com 
管桂超 贵州大学 材料与冶金学院贵阳 550025  
高鹏 贵州大学 材料与冶金学院贵阳 550025  
燕璞 贵州大学 材料与冶金学院贵阳 550025  
刘宪超 贵州大学 材料与冶金学院贵阳 550025  
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中文摘要:
      用恒电位仪测定了不同次氯酸钠浓度和pH的条件下金阳极溶解极化曲线,拟合得到自腐蚀电位(Ecorr)、自腐蚀电流密度(Icorr)以及线性极化电阻(Rp),并进行难浸金矿的搅拌浸出验证实验。结果表明,在不同浓度条件下金腐蚀速率先增大后减小,在浓度0.75 mol/L时金阳极开始钝化,浸出实验结果与电化学研究结果一致;不同pH实验条件下金的腐蚀速率随pH增加而逐渐增大,但pH超过12后浸出率稍有下降,浸金结果与电化学研究结论略有不同。
英文摘要:
      The polarization curves of gold anodic dissolution under different concentration conditions of sodium hypochlorite and pH values were measured by using a potentiostat, and the self-corrosion potential (Ecorr), the self-corrosion current density (Icorr) and the linear polarization resistance (Rp) were calculated by the curve-fitting method. These parameters were subjected to the verification of actual leaching process of a refractory gold ore. The results showed that the gold corrosion rate first increased and then decreased with the augment of sodium hypochlorite concentrations. The gold anode started to passivate at the concentration of 0.75 mol/L. The outcomes of the actual leaching experiments were in good agreement with the electrochemical profile. The corrosion of gold accelerated with the increase of pH values, resulting in an increase of the leaching rate. However, the leaching rate would decreased slightly after the pH value exceeded 12, which is slightly different from the results of the electrochemical studies.
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